A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : DoS vulnerability of TCP by acknowledging not
received segments
Author(s) : A. Azcorra, C. Bernardos
Filename : draft-azcorra-tcpm-tcp-blind-ack-dos-00.txt
Pages : 10
Date : 2004-5-11
TCP relies in communication peers to implement congestion control by
hosts voluntary limiting their own data rate. Nevertheless this
assumption introduces unsolved DoS attack opportunities.
A DoS attack can be easily performed by a host that acknowledges TCP
segments not yet received (maybe even not sent).
This document presents and briefly describes the problem, already
identified and pointed before, but also shows than it can be easily
performed (with very interesting results) and proposes some
server-side modifications to TCP stack in order to make this attack
more difficult to perform. These modifications do nor cause
interoperability issues.
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